{"id":32586,"date":"2019-10-31T21:47:51","date_gmt":"2019-10-31T18:47:51","guid":{"rendered":"https:\/\/prohoster.info\/blog\/kompaniya-cloudflare-opublikovala-xdpcap-analizator-trafika-na-osnove-podsistemy-xdp\/"},"modified":"2019-10-31T21:47:51","modified_gmt":"2019-10-31T18:47:51","slug":"kompaniya-cloudflare-opublikovala-xdpcap-analizator-trafika-na-osnove-podsistemy-xdp","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/kompaniya-cloudflare-opublikovala-xdpcap-analizator-trafika-na-osnove-podsistemy-xdp","title":{"rendered":"Cloudflare har offentliggjort xdpcap, en trafikanalysator baseret p\u00e5 XDP-systemet","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Cloudflare <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.cloudflare.com\/xdpcap\/\">pr\u00e6senterede<\/a><\/noindex> \u00e5bent projekt <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/cloudflare\/xdpcap\">xdpcap<\/a><\/noindex>, hvor et netv\u00e6rkspakkefor analyseringsv\u00e6rkt\u00f8j, der ligner tcpdump, udvikles baseret p\u00e5 subsystemet <noindex><a rel=\"nofollow\" href=\"https:\/\/www.iovisor.org\/technology\/xdp\">XDP<\/a><\/noindex> (eXpress Data Path). Projektkoden er skrevet i Go-sprog og <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/cloudflare\/xdpcap\">distribueres<\/a><\/noindex> under BSD-licensen. Projektet har ogs\u00e5 <noindex><a rel=\"nofollow\" href=\"https:\/\/godoc.org\/github.com\/cloudflare\/xdpcap\">udviklet<\/a><\/noindex> et bibliotek til binding af eBPF-trafikbehandlere fra applikationer skrevet i Go.<\/p>\n<p>xdpcap-v\u00e6rkt\u00f8jet er kompatibelt med tcpdump\/libpcap filtreringsudtryk og g\u00f8r det muligt at behandle v\u00e6sentligt st\u00f8rre m\u00e6ngder trafik p\u00e5 det samme udstyr. Xdpcap kan ogs\u00e5 bruges til fejlfinding under forhold, hvor almindelig tcpdump ikke kan anvendes, for eksempel n\u00e5r der er anvendt filtreringssystemer, d\u00f8dsangrebssikring og belastningsbalancering, der bruger Linux-kernens XDP-subsystem, som behandler pakker f\u00f8r de n\u00e5r Linux-kernens netv\u00e6rksstak (tcpdump ser ikke pakker, der er afvist af XDP-behandleren).<\/p>\n<p>H\u00f8j ydeevne opn\u00e5s ved brug af eBPF- og XDP-subsystemerne. eBPF er en indbygget bytecode-udf\u00f8rer i Linux-kernen, som g\u00f8r det muligt at skabe h\u00f8jtperformante behandlere for indg\u00e5ende\/udg\u00e5ende pakker med beslutningsmuligheder om omdirigering eller afvisning. Ved hj\u00e6lp af JIT-kompilatoren overs\u00e6ttes eBPF-bytecode dynamisk til maskininstruktioner og udf\u00f8res med ydeevne svarende til native kode. XDP-subsystemet (eXpress Data Path) supplerer eBPF med muligheden for at k\u00f8re BPF-programmer p\u00e5 netv\u00e6rksdriverniveau med direkte adgang til DMA-pakkepuffer og fungerer f\u00f8r allokering af skbuff-bufferet af netv\u00e6rksstakken.<\/p>\n<p>Som tcpdump-translaterer xdpcap oprindeligt h\u00f8jniveau trafikfiltreringsregler til en klassisk BPF-repr\u00e6sentation (cBPF) ved hj\u00e6lp af den medf\u00f8lgende libpcap-bibliotek, hvorefter de omdannes til former af eBPF-subprogrammer med kompilatoren <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/cloudflare\/cbpfc\">cbpfc<\/a><\/noindex>, der bruger resultaterne fra LLVM\/Clang. Outputtet gemmer trafikoplysninger i standard pcap-format, hvilket g\u00f8r det muligt at bruge den forberedte xdpcap trafikdump til efterf\u00f8lgende analyse i tcpdump og andre eksisterende trafikanalysatorer. For eksempel, for at fange DNS-traffikoplysninger kan man i stedet for kommandoen &#171;tcpdump ip and udp port 53&#187; k\u00f8re &#171;xdpcap \/path\/to\/hook capture.pcap 'ip and udp port 53'&#187;, hvorefter man kan bruge filen capture.pcap, for eksempel med kommandoen &#171;tcpdump -r&#187; eller i Wireshark.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Kilde: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50593\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Cloudflare \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 \u043e\u0442\u043a\u0440\u044b\u0442\u044b\u0439 \u043f\u0440\u043e\u0435\u043a\u0442 xdpcap, \u0432 \u0440\u0430\u043c\u043a\u0430\u0445 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043f\u043e\u0445\u043e\u0436\u0438\u0439 \u043d\u0430 tcpdump \u0430\u043d\u0430\u043b\u0438\u0437\u0430\u0442\u043e\u0440 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432, \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u044b\u0439 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u044b XDP (eXpress Data Path). \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Go \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 BSD. \u041f\u0440\u043e\u0435\u043a\u0442\u043e\u043c \u0442\u0430\u043a\u0436\u0435 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u0430 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 \u0434\u043b\u044f \u043f\u0440\u0438\u0432\u044f\u0437\u043a\u0438 eBPF-\u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u0442\u0440\u0430\u0444\u0438\u043a\u0430 \u0438\u0437 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Go. \u0423\u0442\u0438\u043b\u0438\u0442\u0430 xdpcap \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u0430 \u0441 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u044f\u043c\u0438 \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u0438 tcpdump\/libpcap [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-32586","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Cloudflare \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 \u043e\u0442\u043a\u0440\u044b\u0442\u044b\u0439 \u043f\u0440\u043e\u0435\u043a\u0442\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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